M
BLK
A1
Control Board
RED
GRN
F2
1
2
Ci rcui t Breaker
5 Amp
S3
Swi tch
SPST Key
GRN
BLK/WHT
4
13
B-2
B-3
M5
M
VIO/YEL
WHT/ GRN
Mo t o r
Brush Actuator
14
B+2
1
B+1
BRN
5BRUSH CONTACTOR
VIO/BLK
BRN
K1
Coil, Brush Motor Contactor
11
12
BRUSH ACTUATOR-2
BRUSH ACTUATOR-1
REMOVE RELAY
FOR/REV
BRUSH MOTOR
B-1
GRA/ BLK
2
8
3
10
GRA/ BLK
YEL
BLK
WHT/ GRA
WHT/ GRA
BLK
M3
M2
M
Mo t o r , Right Brush
Mo t o r , Left Brush
POLARITY FOR DISC BRUSHES
+
-
+
-
R1
POT, 5K Ohm Throttle
POLARITY FOR CYLINDRICAL BRUSHES
+
-
+
-
M3
M
M2
M
Mo t o r , Right Brush
Mo t o r , Left Brush
WHT/ GRA
BLK
WHT
WHT
RED
K1
K3
BLU/WHT
Contact, Brush Remove
Opt i onal
A2
1208 Speed Controller
B-
(T2)
B+
(T1)
B+
B-
P2
(T3)
M1
(T4)
M2
P1
1
2
1
2
3
4
5
6
OUTPUT
OUTPUT
KEYSWITCH
REVERSE
WI PER
FORWARD
+
-
VIO
BRN/WHT
GRN/YEL
1
3
2
POT, 25K Ohm Speed Limit
1
2
2
3
1
RED/BLK
GRA
R2
-
+
Relay, Brush Remove
(Optional)
BRN
ORN/BLK
K3
BLK
- The brush remove circuit sequence starts when the operator depresses the control panel scrub off/brush pressure decrease button (H)
activating the A1 board’s brush remove function. This triggers (starts) an internal timer relay closing the K1 coil ground circuit, pin #5 (Vio/
Blk wire) turning on momentarily the brush solenoid to run the brush motors.
- Simultaneously with the K1 coil being turned on the same input command connects the battery ground connection through the A1 pin #10
wire (Org/Blk) to the K3 coil turning it ON.
- This pulls in the K3 load contact connecting it to the battery ground return.
- The next step is the board timer turning off the K1 brush solenoid and connecting the normally Pos. motor load circuit to a battery ground
return (through the K3 load contact and K1 normal closed contact).
- With two battery ground inputs at the brush motors this circuit causes a short to ground and the motors stop abruptly. The built up brush
inertia easily spins the brushes off the motor drive disc lugs.
FIGURE 1
• Control and Load circuit detail (continued)
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